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首页> 外文期刊>Journal of Applied Polymer Science >Rheological and thermal properties of blends of modified poly(ethylene terephthalate) with p-acetoxybenzoic acid and poly(butylene terephthalate)
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Rheological and thermal properties of blends of modified poly(ethylene terephthalate) with p-acetoxybenzoic acid and poly(butylene terephthalate)

机译：改性聚对苯二甲酸乙二酯与对乙酰氧基苯甲酸和聚对苯二甲酸丁二酯的共混物的流变学和热学性质

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摘要

Blending of thermotropic liquid crystalline polyesters (LCPs) with conventional polymers could result in materials that can be used as an alternative for short fiber-reinforced thermoplastic composites, because of their low melt viscosity as well as their inherent high stiffness and strength, high use temperature, and excellent chemical resistance and low coefficient of expansion. In most of the blends was used LCP of 40 mol % of poly(ethylene terephthalate) (PET) and 60 mol % of p-acetoxybenzoic acid (PABA). In this work, blends of several copolyesters having various PABA compositions from 10 to 70 mol % and poly(butylene terephthalate) (PBT) were prepared and their rheological and thermal properties were investigated. For convenience, the copolyesters were designated as PETA-x, where x is the mol % of PABA. It was found that PET-60 and PET-70 copolyesters decreased the melt viscosity of PBT in the blends and those PBT/PETA-60 and PBT/PETA-70 blends showed different melt viscosity behaviors with the change in shear rate, while blends of PBT and PET-x having less than 50 mol % of PABA exhibited totally different rheological behaviors. The blends of PBT with PETA-50, PETA-60, and PETA-70 showed the morphology of multiple layers of fibers.
机译：热致液晶聚酯（LCP）与常规聚合物的共混物可能会成为短纤维增强热塑性复合材料的替代材料，因为它们的低熔体粘度以及固有的高刚度和强度，高使用温度，并且具有出色的耐化学性和低膨胀系数。在大多数共混物中，使用了40摩尔％的聚对苯二甲酸乙二醇酯（PET）和60摩尔％的对乙酰氧基苯甲酸（PABA）的LCP。在这项工作中，制备了具有10-70 mol％的各种PABA组成的几种共聚酯与聚对苯二甲酸丁二醇酯（PBT）的共混物，并研究了它们的流变学和热学性质。为了方便起见，将共聚酯命名为PETA-x，其中x是PABA的摩尔％。结果发现，PET-60和PET-70共聚酯降低了共混物中PBT的熔融粘度，而PBT / PETA-60和PBT / PETA-70共混物则随着剪切速率的变化而表现出不同的熔融粘度，而具有小于50mol％的PABA的PBT和PET-x表现出完全不同的流变行为。 PBT与PETA-50，PETA-60和PETA-70的共混物显示出多层纤维的形态。

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